Composite separation membrane
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reference example 1
[0047]The porous supporting membrane reinforced with a fiber, used in the present invention, was produced in accordance with the following approach.
[0048]Taffeta (150-denier multifilament yarn for both warp yarn and weft yarn, weaving density: 90 yarns / inch in the length direction and 67 yarns / inch, thickness: 160 μm) composed of a 30 cm long×20 cm wide polyester fiber was fixed to a glass plate, and a 15 weight % dimethylformamide solution of polysulfone (Udel (Registered Trademark) produced by Amoco, P-3500) was casted thereon at room temperature (25° C.) to provide a thickness of 200 μm, immediately followed by immersion in pure water and leaving as it was for 5 minutes, thereby obtaining a porous supporting membrane. The pure water permeation coefficient of the thus obtained porous supporting membrane was 0.005 to 0.01 kg / cm2 / sec / atm (about 0.001 to 0.002 g / cm2 / sec / MPa), which was measured at a pressure of 0.1 MPa and a temperature of 25° C. In addition, the average pore size at...
example 1
[0049]The porous supporting membrane produced in accordance with Reference Example 1 was brought into contact with an isopropyl alcohol solution containing 3.6 weight % of sodium styrenesulfonate, 0.4 weight % of Methacryl-POSS (polyhedral oligomeric silsesquioxane), 0.24 weight % of 2,2-dimethoxy-2-phenylacetophenone as an α-hydroxyacetophenone type photopolymerization initiator, and 33.5 weight % of pure water for 1 minute, and nitrogen was sprayed from an air nozzle to remove the extra solution from the surface of the porous supporting membrane, thereby forming a layer of the solution on the porous supporting membrane. Then, with the use of an excimer lamp (UER 20-172) produced by Ushio, inc., capable of irradiation with ultraviolet rays of 172 nm, the distance between the excimer lamp and the porous supporting membrane was set to 1 cm under a nitrogen atmosphere with an oxygen concentration of 0.1% or less, and irradiation with ultraviolet rays was carried out for 5 minutes to p...
example 2
[0050]A composite separation membrane was produced in the same way as in Example 1, except that an isopropyl alcohol solution containing 1.8 weight % of an acrylic acid, 0.2 weight % of Methacryl-POSS, and 0.12 weight % of 2,2-dimethoxy-2-phenyl acetophenone was used instead of the solution applied onto the porous supporting membrane in Example 1. The thus obtained composite separation membrane was evaluated in the same way as in Example 1 to obtain the performance shown in Table 1.
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Abstract
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